ios, stream: replace <iostream> with leaner and faster own streaming

Our test program runs 15 minutes using our streams vs. 25 minutes using
std::iostream derived streams.

Streams were ported from Amebis AOsn project.

Signed-off-by: Simon Rozman <simon@rozman.si>

UnitTests/stream.cpp

@@ -0,0 +1,111 @@
+/*
+	SPDX-License-Identifier: MIT
+	Copyright © 2023 Amebis
+*/
+
+#include "pch.h"
+
+using namespace std;
+using namespace Microsoft::VisualStudio::CppUnitTestFramework;
+
+namespace UnitTests
+{
+	TEST_CLASS(stream)
+	{
+	public:
+		TEST_METHOD(async)
+		{
+			constexpr size_t total = 1000;
+			stdex::stream::memory_file source(stdex::mul(total, sizeof(size_t)));
+			{
+				stdex::stream::async_writer<70> writer(source);
+				for (size_t i = 0; i < total; ++i) {
+					Assert::IsTrue(writer.ok());
+					writer << i;
+				}
+			}
+			Assert::AreEqual<fpos_t>(0, source.seekbeg(0));
+			{
+				stdex::stream::async_reader<50> reader(source);
+				size_t x;
+				for (size_t i = 0; i < total; ++i) {
+					reader >> x;
+					Assert::IsTrue(reader.ok());
+					Assert::AreEqual(i, x);
+				}
+				reader >> x;
+				Assert::IsFalse(reader.ok());
+			}
+		}
+
+		TEST_METHOD(replicator)
+		{
+			constexpr size_t total = 1000;
+
+			stdex::stream::memory_file f1(stdex::mul(total, sizeof(size_t)));
+
+			std::basic_string<stdex::sys_char> filename2, filename3;
+#ifdef _WIN32
+			{
+				TCHAR temp_path[MAX_PATH];
+				Assert::IsTrue(ExpandEnvironmentStrings(_T("%TEMP%\\"), temp_path, _countof(temp_path)) < MAX_PATH);
+				filename2 = filename3 = temp_path;
+			}
+#else
+			filename2 = filename3 = "/tmp/";
+#endif
+			filename2 += _T("stdex-stream-replicator-2.tmp");
+			stdex::stream::file f2(
+				filename2.c_str(),
+				stdex::stream::mode_for_reading | stdex::stream::mode_for_writing | stdex::stream::mode_create | stdex::stream::mode_binary);
+
+			filename3 += _T("stdex-stream-replicator-3.tmp");
+			stdex::stream::cached_file f3(
+				filename3.c_str(),
+				stdex::stream::mode_for_reading | stdex::stream::mode_for_writing | stdex::stream::mode_create | stdex::stream::mode_binary,
+				128);
+
+			{
+				stdex::stream::replicator writer;
+				stdex::stream::buffer f2_buf(f2, 0, 32);
+				writer.push_back(&f1);
+				writer.push_back(&f2_buf);
+				writer.push_back(&f3);
+				for (size_t i = 0; i < total; ++i) {
+					Assert::IsTrue(writer.ok());
+					writer << i;
+				}
+			}
+
+			f1.seekbeg(0);
+			f2.seekbeg(0);
+			f3.seekbeg(0);
+			{
+				stdex::stream::buffer f2_buf(f2, 64, 0);
+				size_t x;
+				for (size_t i = 0; i < total; ++i) {
+					f1 >> x;
+					Assert::IsTrue(f1.ok());
+					Assert::AreEqual(i, x);
+					f2_buf >> x;
+					Assert::IsTrue(f2_buf.ok());
+					Assert::AreEqual(i, x);
+					f3 >> x;
+					Assert::IsTrue(f3.ok());
+					Assert::AreEqual(i, x);
+				}
+				f1 >> x;
+				Assert::IsFalse(f1.ok());
+				f2_buf >> x;
+				Assert::IsFalse(f2_buf.ok());
+				f3 >> x;
+				Assert::IsFalse(f3.ok());
+			}
+
+			f2.close();
+			std::filesystem::remove(filename2);
+			f3.close();
+			std::filesystem::remove(filename3);
+		}
+	};
+}